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Fake Microsoft security scans trick victims into uninstalling their antivirus

medmalwarebytes_blogPublished 2026-08-24

<p class="wp-block-paragraph">A wave of websites is offering to check whether your antivirus is working. They call themselves <strong>SysScan</strong>, carry Microsoft branding, and all reach the same conclusion: Your computer has serious problems, and the cause is the antivirus software you installed.</p>

<p class="wp-block-paragraph">Windows, they claim, no longer supports third-party antivir

MITRE ATT&CK techniques

Indicators of compromise

Original source: https://www.malwarebytes.com/blog/threat-intel/2026/08/fake-microsoft-security-scans-trick-victims-into-uninstalling-their-antivirus